I've written more detailed posts about this:
Yes, it is. They are not introducing BTC into circulation. This is verifiable via the blockchain.
Banks creating IOU's or derivatives or whatever other abstraction they can come up with never generates new BTC. You'd hope that people foolish enough to work with such financial institutions would know the risk of possessing nothing but an instrument created by the bank. If you're unwilling to take custody of your own bitcoin, you better damn well do some good research on third party custodians.
If you deposit 1 BTC on Binance, then I can get your BTC in the form of a loan. I can even withdraw your BTC. Meanwhile, Binance records still say you have 1 BTC, they even allow you to trade with it. So there's really 2 BTC in circulation. That BTC is duplicated, it's in multiple places simultaneously.
But this doesn't happen with Bitcoin.
It's true that there are a number of DeFi apps that will loan BTC.
However if you look at the loan mechanism it is different to how it is done in traditional finance.
A BTC loan is done in one of two ways:
1) The original owner of the BTC is given an IOU in the form of a different token (lets call it "Wrapped BTC" or wBTC) and the original BTC token is given to the person taking the loan, OR
2) The person taking the loan is given another token ("wBTC"). This is more common.
In both these cases no new BTC is actually created. It's possible to create more of this other token though. In the specific case of wBTC[1] they say it is 1:1 backed with BTC, but other tokens might not have the same backing.
I don't have a strong opinion on the utility of BTC, but I think it is worth being accurate in our discussion.
It doesn't happen on the bitcoin blockchain. Exchanges are black boxes though, we don't always know what's going on in there.
If you think otherwise explain the mechanism you think is happening.
Everything keeps functioning because the exchange is a black box and not everyone wants to move their BTC at the same time. More people can 'own' BTC on paper than there is BTC in existence on the blockchain.
In the same way that most BTC transactions don't involve the blockchain either, they take place entirely within exchanges.
But for BTC you can't do this. If they have 100 BTC deposited from all their users and then try to loan out 101 that 101st transaction is impossible because the bitcoin isn't there.
You may as well talk about this being impossible with paper money, the bank can't give out more than it has! There are only so many notes! But it doesn't need to. People can trade within the bank and between banks so long as the reserves cover the activities.
Quadriga CX worked this way, until it didn't and everyone discovered their cryptocurrency was fictional.
Sure, within the exchange that's true. The instance the BTC leaves the exchange as a loan or withdrawl it is no longer possible for that BTC.
> Quadriga CX worked this way, until it didn't and everyone discovered their cryptocurrency was fictional.
I don't think this was the case, unless you can show me otherwise.
In particular, they had "BTC ATMs" where people could withdraw cash. Note that this is not loaning BTC.
And when the CEO died, the BTC could not be retrieved. There was no magic second exchange-issued BTC around - it was gone because there is only one copy.
Notably there is a precise accounting of the BTC that was lost because there is a public ledger of it. Quadriga CX didn't produce any more BTC - they just lost their customer's BTC.
Quadriga CX showed their users having BTC in their accounts.
In reality, the guy running the show had already gambled those away on other exchanges.
It all held together, ish, until he died and the music stopped.
> In particular, they had "BTC ATMs" where people could withdraw cash.
This is news to me and hasn't featured in any write-up of QCX I've ever seen.
> And when the CEO died, the BTC could not be retrieved. There was no magic second exchange-issued BTC around - it was gone because there is only one copy.
Yes, this is exactly what we're talking about - we have no real idea how much BTC is in peoples accounts on exchanges, because they are a black box and may be creating it out of thin air. While they don't try to move too much of it and the exchange remains operational, the ecosystem functions as if those balances are correct.
> Quadriga CX didn't produce any more BTC - they just lost their customer's BTC.
While they were still solvent it behaved as if there were more BTC present. Sure, they didn't create more on the blockchain, but they were able to operate as if there was more.
Until they weren't.
So as I said - they can't lend more than 100% of the BTC they have. They can make up anything want within their own exchange of course.
The exchange's BTC reserves only matter when customers try to withdraw their coins. Until then, the coins are nothing but digits in their database. They can inflate that number as much as they want.
In DeFi apps you need an actual token to use. If you don't have a the token you can't do a transaction, and apps choose which tokens they support.
So an exchange can create its own token, say it is backed 1:1 by BTC and lend that. But it isn't BTC so apps have to specifically opt into it.
If they loan out the actual BTC they have in the exchange they can only loan out 100% of what they have (not more) because control and use of each BTC token is dictated by the public ledger which is out of their control.
You can do other things (eg use the BTC as collateral for a dollar loan), but again you aren't lending BTC.
https://news.ycombinator.com/item?id=31375366
Accounting tricks, basically. They say you have BTC in your account when in fact your deposit is tied up in investments, loans.
It absolutely does. I can get a loan at an exchange while the original owners of those BTC still have it listed under their accounts. So multiple people can trade with the same coins, as if they had been copied.
> When the fractional-reserve imaginary bitcoin implodes, it might even increase the price of actual bitcoin?
Unknown. Perhaps.